Screen assembly

Abstract

A screen assembly 22 includes a conveyor 26 pivotably mounted beneath a screen 24 for segregation of fractions of material, for example from a mobile crusher 10. Hydraulic cylinders (not shown) are used to selectively move telescopic arms 48 (only one of which is shown in the Figures), to raise or lower the conveyor 26 between operative position and inoperative positions. In the operative position the conveyor 26 is substantially parallel to the screen 24 for receiving material which has passed through the screen mesh, in use. In the inoperative position the conveyor 26 is angularly displaced relative to the screen 24 about the pivot, to provide access to the underside of the screen 24, e.g. for maintenance purposes. Removable pins 50 are provided for releasably securing the attitude of the conveyor 26 relative to the screen 24 in the operative position.

1. A screen assembly for a material processing plant, the assembly comprising:
 a screen having a mesh for segregation of fractions of material placed thereon;  
 a conveyor mounted beneath the screen by a pivot connection, the conveyor having a first end and being movable between  
 i) an operative position in which the conveyor is disposed substantially parallel to the screen or receiving material which is passed through the screen, in use, and  
 ii) an inoperative position in which the conveyor is angularly displaced about the pivot connection before providing access to the underside of the screen; and  
 releasable connection means between the screen and the conveyor in a fixed position relative to the screen in the operative position, and for enabling adjustment of the altitude of the conveyor relative to the screen so as to enable the first end of the conveyor to move away from the screen to the inoperative position.  
 
   
   
     2. A screen assembly according to  claim 1 , wherein the pivot connection between the screen and conveyor is provided at respective ends of the screen and conveyor, such that, in the inoperative position, the free ends of the screen and conveyor are displaced away from one another, to allow substantially maximum access to the underside of the screen. 
   
   
     3. A screen assembly according to  claim 1 , wherein the means for releasably securing the attitude of the conveyor relative to the screen in the operative position consists of at least one connecting member having two ends, one end connected to the conveyor and the other end connected to the screen, and at least one end of the connecting member being releasably connectable to the conveyor or screen respectively. 
   
   
     4. A screen assembly according to  claim 1 , wherein the means for releasably securing the attitude of the conveyor relative to the screen includes at least one removable pin. 
   
   
     5. A screen assembly according to  claim 1 , wherein the screen assembly includes means for connecting the screen assembly to a material processing plant. 
   
   
     6. A screen assembly according to  claim 5 , wherein the screen assembly is pivotably mounted on the means for connecting the screen assembly to a material processing plant, for pivotable movement of the screen assembly relative to the plant, in use. 
   
   
     7. A screen assembly according to  claim 5 , wherein the means for connecting the screen assembly to a material processing plant includes at least one telescopic member having two ends, one end of the at least one telescopic member being connected to the screen assembly, and the other end of the at least one telescopic member being connectable to the material processing plant, for raising or lowering one end of the screen assembly relative to the plant. 
   
   
     8. A screen assembly according to  claim 7 , wherein the at least one telescopic member includes a hydraulic cylinder for selectively moving the telescopic member between an extended position and a retracted position. 
   
   
     9. A screen assembly according to  claim 1 , wherein the screen assembly includes a subframe connectable to a material processing plant, for mounting the screen assembly on the plant. 
   
   
     10. A screen assembly according to  claim 1 , wherein the underside of the screen assembly includes a support member for supporting the screen assembly in a lowered position, in use.